Printing-machine



v. Elt. CHAU'VETTE.

u PRINTING MACHINE. APPLICATION FILED! JULY 1, 1920.

3 SHEETS-SHEET 1.

v E11. CHAUVETTE. PRINTING MACH|NE. APPLICATION FILED JULY 1, 1920.

1,398,36Q v Patented Noi. 29, 1921..

3 SHEETS-SHEET 2.

' V. E; L. 'CHAUVETTE.

PRINTING MACHINJE. APPLICATION FILED JULY 1. 1920.

Patented. Nov, 29, 1921!.

m gaw,

3 SHEETS-SHEET 3- INVENTOR \(m i'oa Eugene Louis Chm; vafla moron, EUGENE LOUIS 'onnuvnrrn, or n were, a

PRINTING-MACHINE.

naeaseo.

Specification of Letters Patent.

Patented No v. 29, 192i.

Application filed July 1, 1920. Serial to. 393,354.

To all whom it may concern:

Be it known that I, Vroron EUGENE LOUIS (JHAUVETTE, citizen of the Republic of France, residin at 21 Rue Ganneron, Paris, in the Republic of France, have invented new and useful Improvements in Printing-Machines, (for which I have filed an application in France, July 18th, 1919,) of which the following is a specification.

This invention has for its object a printing machine adapted to print upon wooden panels or any other similar materials which are not suflicientlyfiexible and cannot be carried along in rotary movement around a cylinder. Printing is effected in the machlne by transfer on an intermediate cylinder provided with a rubber coating. Im-

portant features of the improved machine are the operating device for the bed and .preventingany movement of the panel duringtlie printing operation.

- 'inder .C is itselfdriven by the belt pul ey.

In the accompanying drawings given by way of example:

igure 1 is an end elevation of the improved machine.-

Fig. 2 is a corresponding side elevation.

Fig. 3 is a section view of the means used for maintaining the panel to be printed upon the bed.

Fig. 4 is aside view of a detail of the machine.

The printing plate P is carried by the printing cylinder A which is drNen -by the intermediate cylinder C through the medium of toothed wheels L and 0'. The c l- U through the reducing gearin S, T, R, Q.

By reason of the porosity 0 wood, it is necessary to effect a strong inking which will permit the employment of a thick ink and for that reason a'n inking surface having an area twice that of the printing surface, 'L-e.

\ the plate'Pi carrying the lithographic design, has been provided. The plate P extend's'thus over one third only of the surface of the cylinder A which in its rotation brings the plate incontact first with the wetting rollers M and then with the inking rollers E. The cylinder continuing to revol've, the printing plate is brought into contact with the rubber coating or blanket B provided on the intermediate cylinder'C. The design is'thus transferred onto the rubher cylinder and in the rotation of the-latter transferred again from that cylinder onto the wood panel placed upon the bed D.

. The bed D is reciprocated horizontally by the following means. In its operative or printing stroke, it is driven by two toothed sectors F which extend over one third of the circumference of the c linder C and mesh with two racks V provi ed on the sides of the bed. When the toothed sectors abandon theracks, the bed is no longer actuated and it abuts against dampening springs not shown and stands still. At this ,time, another toothed sector'G provided on the cyl inder C and forming a prolongation of one of the toothed sectors F but located in a different transverseplane, engages with a pinion H which is in mesh with a. pinion I keyed on the sameshaft as a central pinion J which is itself in engagement with a lonitudinal rack K secured under the bed D.

he latter is thus brought back to its original position.

The bed will then stand still until the A of cylinder C. This interval 'is used for placing the wood panel in position on the bed. The panel is maintained against three stgp pins: two at the end and one on the s1 e.

As it is important to rigidly secure the panel upon the bed so as to prevent any relative movement of said member duringthe printing operation, the following pneumatic device is provided. The bed D is hollow,

and has a perforated top wall. It is connected by a valve W to a flexible pipe Y in communication with a tank X in which vacuum is produced by a pump operated by the driving mechanism of the machine. The

valve W 1s operated as follows:

When the panel to be printed has been placed in position upon the bed, and when said bed begins to move to the left (Figs. 1 and 3) the roller Z is lifted by a runway Z rigidly secured to the frame of the machine. The valve W is thus lifted also and the bed is set in communication with the vacuum tank X, and the panel is held on the bed by atmospheric pressure. When the printing is eflected, the bed at the end of its stroke actuates a second valve W which is opened by running against the frame of the machine; the air isthen al-- Y Furthermore, when the bed begins to run rearward, a boss 1 provided on the end of the cylinder G comes into contact with a roller 2 which is pushed downward and operates a lever 4 pivoted on a fixed axis 3 connected to the frame of the machine {the piston 6 is thus moved upward, compressing the spring 8 inside a box 7 secured also to the frame of the machine the lever 10 is caused to pivot about the fixed axis 11 and a small steel rod 12 is lowered and engages with the rear end of the panel and-holds the same in position while the bed slides under the panel in returning to its original position. The panel then drops upon an inclined plane and slides onto a receiving table.

A similar arrangement is provided at the other side of the machine, and the bosses 1 extend over an arc of 120 on the circumference of the cylinder ,C. Thus when the rearward movement of the bed is completed, the rollers 2 are freed and the steel rods 12 are lifted, to allow the passage of the next panel to be printed.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is 1. A printing machine comprising a rotary printing cylinder, a transfer cylinder, said cylinders running constantly and at the same speed, and being mounted respectively ina fixed position with regard to each other, a reciprocating bed, means for rotating the cylinders, means for reciprocating the bed,

7 a printing surface secured on the printing cylinder and extending over one third of the circumference of the cylinder and an ink table constituted by the remaining two thirds of said circumference and adapted to engage inkin rollers suitably disposed.

2. A printing machine comprising a rotary printing cylinder, a transfer cylinder, said cylinders running constantly and at the same speed, and being mounted respectively in a fixed position with regard to eachother, a reciprocating bed, means for rotating the cylinders, toothed racks on the bed, toothed sectors on the transfer cylinder in engagement with said racks and adapted to move the bed in one direction, a reversing rack on the bed, a reversing toothed sector on the transfer cylinder and means for operatively connecting the reversing toothed sector to the reversing rack.

3. A printing machine comprising a rotary printing cylinder, a transfer cylinder, said cylinders running constantly and at the same speed, and being mounted respectively in a fixed position with regard to each other, a reciprocating bed, means for rotating the ylinders, toothed racks on the bed, toothed sectors on the transfer cylinder in engagement with said racks and adapted to move the bed in one direction, a reversing rack on the bed, a reversing toothed sector on the transfer cylinder, means for operatively connecting the reversing toothed sector to the reversing rack and pneumatic means for securing the work on the bed.

4. A printing machinecomprising a rotary printing cylinder, a transfer cylinder, said cylinders running constantly and at the sam speed, and being mounted respectively in a fixed position with regard to each other, a reciprocating bed, means for rotating the cylinders, toothed racks on the bed, toothed sectors on the transfer cylinder in engagement with said racks and adapted to move the bed in one direction, a reversing rack on the bed, a reversing toothed sector on the transfer cylinder, means for o eratively connecting the reversing toothe sector to the reversing rack and work controlled pneumatic means for securing th work on the bed.

In testimony whereof I have signed my nam to this specification.

VICTOR EUGENE LOUlS CHAUVETTE. 

